Abdominal exercise machine



FIG. 1. Is a perspective view of my abdominal exercise machine;

FIG. 2. Is a side elevational view thereof; the reverse side elevational view being identical thereto;

FIG. 3. Is a front view thereof

FIG. 4. Is a rear view thereof;

FIG. 5. Is a top plan view thereof; and,

FIG. 6. is a bottom view thereof.

The broken line showing portions of the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an abdominal exercise machine, as shown and described herein. 